Cutter head



Apr-i129, 1924.

c. G. CASHMAN CUTTER HEAD Filed Feb. 21. 1920 4 Sheets-Sheet 1 Elma/MM April 29 1924. 1,492,424

c. e. CASHMAN CUTTER HEAD Filed Feb. 21; 1920 4 Sheets-Sheet 2 Jkiyi @461 April 29, 1924.

C. G. CASHMAN CUTTER HEAD Filed Feb. 21

April 29 1924. i 1,4923%4 c. G. CASHMAN CUTTER HEAD Filed Feb. 21. 1920 4 Sheets-Sheet 4 ('(arence Geog/741177 Guam;

Patented Apr. :2, 124.

w 5 al 3.

OFFHCE.

AN D MESN E ASSIGNMENTS, TO LAN DIS MACHINE COMPANY, OF WAYNESIBORO,

PENNSYLVANIA, A CORPORATION OF PENNSYLVANIA.

CUTTER HEAD.

App11cation flled February 21, 1920. Serial No. 360,468

To all whom it may concern:

Be it known that I, CLARENCE G. CASE- MAN, a citizen of the United States, residing at State of Pennsylvania, have invented certain new and useful Improvements in Cutter Heads, of which the following is a specification.

y invention relates to improvement in 1 the details of construction and arrangement of parts of cutter-heads and has for its object to provide a light and durable construction operating with a minimum of friction and permitting of ready adjustment of all 1 component parts or elements without dissembl-ing the cutter-head or removing it from the machine.

Another object is to reduce wear to a minimum thereby prolonging the life of a cutter-head by enclosing all operating elements and means permitting of adjustment of the chaser-holders within theibody of the cutter-head.

\Vith these and other objects in View my 5 invention consists in the novel combination and compact arrangement of parts hereinafter more fully described and illustrated in the accompanying drawing in which 2-- Figure 1 is a .front elevation, partially 0 broken away of my improved cutter-head in open position, showing one chaser-holder in position, the others being removed to show improvements in construction.

Fig. 2 is a cross section on the line 22 of Fig. 1 with an additional chaser-holder in position and showing the general arrangement of co-operating elements.

Fig. 3 is a rear elevation of my assembled cutter-head.

Fig. 4 is a section on line 4-4 of Fig. 3, illustrating the mounting of one of the d e opening springs, and its co-operative relation with elements for opening the die.

' Fig. 5 is a section on line 5-5 of Fig. 1, showing one of the connecting elements between the two portions of the positioning r ng.

Fig. 6 is a similar section on line 66 of Fig. 1. showing another of the connecting elements.

Fig. 7 is a perspective view partially in Waynesboro, in the county of F 'rank-, 5 lin and collar.

Fig. 12 is a perspective view of the annular casing or shell.

The cutter-head broadly comprises a body or casting 1 provided with a central aperture 2 of suflicient dimensions to receive the work up to the capacity of the head and four recessed bearings 15 symmetrically arranged in the face thereof to receive the cylindrical bushings 3 in which the spindles 4 of the chaser-holders 5 are journaled. The said spindles 4 are formed with a series ofcircumferential grooves or race ways 6 in which antifriction balls 7 provide an anti-friction jourrial bearing with the cylindrical bushing 3. A centrally arranged bore 8. extends through said spindle 4 being further recessed adjacent itsouter extremity to provide an anseat. A retaining screw 11 adapted to pass through the bore 8 of the spindle 4 and formed at one end with an enlarged head portion 12 adapted to bear against the thrust bearing 10 is formed at its other end with a screw-threaded shank 13. A hollow adjust ing screw 14 is provided with screw threads on its inner diameter to receive the screwthreaded shank 13 of theretaining screw 11 and threaded on itsperipheral surface to engage an internallv screw-threaded aperture in the rear. wall of the recessed hearing 15. I

An annular groove 16 is provided in the face of the cutter-head body 1' with which four arcuate apertures 17 symmetrically arranged in the face thereof, register. A ring .nular shoulder 9 upon which an anti-friction thrust bearing element 10 is adapted to 18, which for convenience I will call the g erably en chaser-holder positioning ring, is rotatalbly mounted in theannular groove 16 and has four spaced bearings 19. The chaser-holder formed on the face of the cutter-head body 1 adjacent the periphery of the positioning ring 18 and a registering zero or diameter determining index 26 is carried by the ring 18.

A ring 27 is rotatably mounted in said body adjacent the rear wall of the face of the cutter-head body 1 and will also be termed a positioning ring inasmuch as rigid connecting elements comprising screws 28 and driven pins 29 securely lock the two rings 18 and 27 together through the arcuate aperture 17 to operate as a unit. As shown in Figs. 1, 5 and 6, the ring 27 has blocks or extensions 27 extending through the apertures 27 b in the web 27 of the body, the apertures being of greater width than the blocks, as clearly shown in Fig. 1, so that the rings 18 and 27 can turn as a unit relative to the body.

A plurality of symmetrically arranged transverse slots 30 are for-med in the inner diameter of the positioning ring 27 with which the free ends 31 of the springs 32 engage through elongated apertures 33 in the body of the cutter-head 1.. The springs 32 are bent adjacent their rear ends and securely anchored by a driven fitting in perforations 34 in the rear face of the cutterhead body 1 as is clearly shown in Figs. 3 and 4. 1

A ring 35, which I will term the sizing ring, is rotatably mounted in the said body 1 adjacent to and co-axial with the positioning ring 27, and is formed with a radial slot 36, in which a block 37 formed with a recessed bearing 38 is mounted. A block 39 formed with a spindle 40 journaled in the recessed bearing 38 in the block 37 is adapted to extend into the recess 41 formed in the positioning ring 27. A transverse adjusting screw 42 passing through and opgaging a screw-threaded aperture 47 in the I lock 39 is journaled adjacent its extremities in bearings 43 and 44 formed in the positioning ring 27 and held against longitudinal displacement by means of the head 45 and nut 46. The head 45 of the adjusting screw 42 is formed with a. hexagonal recess 48 in its face to receive a wrench (not shown).

A circumferential recess 49 is formed in the body of the cutter-head 1 adjacent the rear face of the sizing ring 35 in which a stop collar 50 is secured by means of screws.

A yoke 51 mounted for longitudinal movement on the body of the cutter-head 1 is formed on its inner diameter with a series of symmetric-ally arranged longitudinal slots in which are secured ball race ways 52. A similar series of registering ball race ways 53 carrying anti-friction balls 54 are secured in longitudinal slots formed in the peripheral surface of the body of the cutter-head 1. The sliding yoke 51 is formed with a series of symmetrically arranged recessed bearings 55 (Figs. 3 and 10) in which are journaled trunnions or spindles 56 formed with an annular shoulder 57 and a circumferential retaining groove 58. screw-threaded aperture is formed in the yoke 51 registering with the circumferential groove 58 in the trunnions or spindles 56 in which an anti-friction ball 59 and a screw 60 coact to retain the trunnions or formed with longitudinally extending portions having two cam faces 61 and 62 and a stop 63. series of sockets 64 are formed in the rear face of the sizing ring 35 to register with the longitudinally extending cam portions of the trunnions or spindles 56, journaled in the yoke 51. Cages 65 carrying anti-friction rollers 66 are mounted in radial slots formed in the rear face of the sizing ring 35 adjacent opposite sides of the sockets 64, and secured therein by screws 67.

A shifter collar 68 is formed with oppositely disposed trunnions 69 and 70 and journaled in a circumferential groove in the periphery of the yoke 51 between the shoulders 71 and 72.

An annular shell or casing 73' formed with an elongated aperture 74 adapted to register with the operating head 48 of the transverse adjusting screw 42 is secured in an annular recess in the periphery of the rear wall of the face of the cutter-head body 1 by means of screws 75 engaging apertures 76 in the shell or casing 73 and extending rearwardly therefrom.

The operation is as follows: Assuming that the die, composed of chasers 77, mounted on the chaser-holders 5, is open, as shown in Fig. 1, and it is desired to adjust the die to work of predetermined size for cutting right hand threads, a hex wrench, not shown, is

inserted through the elongated apertured portion 74 of the casing or shell 73 and fitted in the hexagonal socket 48 formed in the end of the transverse adjusting screw 42rcarried by the positioning ring 27 and rotated. This rotation of the transverse adjusting screw 42 effects a relative circumferential adjust-.

ment between the positioning ring 27 and the sizing ring 35. This circumferential adjustment of the positioning ring 27 is imparted to the ring 18 by the connecting pins and and ustment to the screws 28 and 29 extendin through the armate apertures 17 in the face of the cutterhead body 1' and adjustment imparted to the chaser holders by links 23 connecting the ring 18 with each of the chaser-holders 5.

It is obvious that when the die is assembled for cutting left hand threads the same adjustment may be made by imparting rotation to the transverse screw 42in the reverse direction.

Further adjustments are necessary as to the length and also the lead angle of the individual chasers 77 which are shown in the accompanying drawing but which are made the subject matter of additional applications filed of even date herewith and will therefore not be described herein.

.The die being adjusted as above described the graduations 25 cut into the face of the cutter-head adjacent the chaser-holder positioning ring 18 which carries the zero or diameter determining index 26, the cutterhead is ready for operation. The clutchingin operating mechanism (not shown) engages the trunnions 69 and 70 carried by the shifter collar 68 journaled on the sliding yoke 51 between the annular shoulders 71 and 7 2 and serves to impart longitudinal adyoke ,for effecting opening and closing of the die now to be described.

The closing of the die is effected by the forward sliding engagement of the cam faces 61 and 62 of the trunnions 56 journaled in the recessed bearings 55 in the sliding yoke 51 and the sides of the sockets 66 formed in the rear side of the sizing ring 35. It will thus be readily seen that by shifting or adjusting the yoke 51 longitudinally the interengaging faces of the earns 61 and 62 and the sockets 64 will impart a rotative movement in one direction or the other to ,the sizing ring 35 and the positioning rings 27 and 18, which are secured together by means permitting of circumferential adjustment above described against the action of the springs 32, mounted in'the body 1, and extending into slots 30 formed in the inner diameter of the positioning ring 27 for normally maintaining the diein open position. This oscillation of the positioning. ring 27 effects the closing of the die through the medium of the links 23 journaled at one end in bearings 19 in the positioning ring 18 and: at their other end in bearings 21 formed in a wing 20 forming a part of the chaser-holder 5 for oscillating the chaser-holders on the spindles 4 in the recessed anti-friction bearings 15 in the face of the cutter-head body 1.

The opening of the die is effected by reversing the operation just described, the springs 32 turning the positioning ring 27 in the reverse direction to open the die when the yoke 51 is retracted, as will be understood,

set to a predetermined size by means of ings,

Having thus described myinvention, what desire to secure by Letsaid first mentioned ring circumferentially and securing it in adjusted position.

2. A cutter-head comprising a hollow body formed with bearings, cutter-holders formedwith spindles, journaled in said bear a composite ring mounted in said hollow body and operating through arcuate apertures in the face of said body, means operatively connecting said composite ring with each of said cutter-holders and means for adjusting said composite ring circumferentially and securing it in' adjusted position.

3. A cutter-head comprising a body formed with bearings in the face thereof, cutter-holders journaled in said bearings, a ring mounted in said body and means operativel y connecting parts carried by said ring extending through apertures in the face of said body with each of said cutter holders.

4. A cutter-head comprising a hollow body, cutter-holders journaled in the face of said body, means for adjusting and locking said cutter-holders in adjusted position comprising a positioning ring and a sizing ring operating together as a unit and integral and co-operating means for varying the relative circumferential relation of said rings and sliding cam means adapted to cooperate with said sizing ring for oscillating same. I

5. A cutter-head cutter-holders mounted on spindles, said spindles journaled in bearings in said body, a ring mounted in said body with which each of said cutter-holders is connected, means for adjusting said ring, means for opening and closing the die comprising a sliding cam adapted to engage a part carried by said ring, and means for operating said sliding cam.

6. In a cutter-head the combination of the body, the cutter-holders mounted on spindles journaled in said body, a ring mounted in said body operably connected with each of said cutter-holders, a second ring mounted in said body adjacent to said first ring, means securing said rings together for relative circumferential adjustment comprising a screw on one ring co-operating with the other ring, means for effecting opening and closing of the die comprising cam means slidable on said body adapted to engage ried by another of said rings said second ring for oscillating same, and means'for operating said sliding cam means.

- 7. In a cutter-head, the combination of the body, the movable cutter-holders journaled in said body, a rotatable ring mounted in said body and operably connected with each of said cutter-holders to open and close the die, a second rin mounted adjacent said first ring means rigidly securing said rings together for relative circumferential adjustment, said second ring bein formed with sockets in its rear face, a t ird ring mounted in said body to slide to and from the rear face of said second ring, cam elements carried by said third ring slidably engaging with the sockets in said secon ring, and means for adjusting said third ring longitudinally in said body.

8. In a cutter-head, the combination of the body, the cutter-holders journaled in said body, a series of co-operating rings mounted in said body, means operably connecting one of said rings with each of said cutter-holders, resilient means carried by said body and engaging said ring to oscillate same to open the die, and cam means caradapted to close the die when same is operated.

9. In a cutter-head, the combination of the body, the cutter-holders journaled in said body, a ring mounted in said body, links connecting each of said cutter-holders to said ring, springs disposed in said body operative on said ring to open the die a second ring, and means co-operating with said second ring for closing said die against the tension of said springs.

l 10. In a cutter-head, the combination of a body, cutter-holders journaled in said body, a ring mounted in said body, a second ring mounted in said body, means connecting said rings through arcuate apertures in the faceof said body, links 0 eratively connectin said second ring with each of said cutter liolders, resilient means mounted in said body and acting on said first mentioned ring to open the die, a third ring mounted in said body adjacent said first mentioned ring and rigidly secured therewith by interengaging portions permitting of relative circumferential adjustment, said third ring being formed with sockets in its rear face, a yoke mounted in said body to slide to and from the rear face of said third ring, cams carried by said yoke slidably engaging with the sockets in said third ring to oscillate said series of rings against the tension of said resilient means and close the die when same is operated.

11. A cutter-head comprising a body formed with recessed bearings in the face thereof, cylindrical sleeves fitted in said recessed bearings, cutter-holders formed with spindles having circumferential arace ways journaled in said cylindrical sleeves, antifriction balls in said race ways, an annular structure mounted in said body and operatively connecting each of said cutter-holders, means for adjusting said annular structure circumferentially comprising a transverse screw, a sliding cam unit co-operating with said annular structure to oscillate same and close the die and means for operating said cam unit.

12. A cutter-head comprising a body formed with bearings, cutter-holders formed with spindles journaled in said bearings, an

annular structure mounted in said body and operatively connecting each of said cutterholders, a sliding yoke mounted on said d body adjacent to said annular structure, provided with longitudinally race ways in its inner diameter, similar and registering race ways formed in said body, anti-friction balls in said race ways, cam means connecting said yoke with said ring structure, and means for sliding said yoke on said anti-friction 'balls.

13. A cutter-head comprising a body formed with bearings, cutter-holders formed with spindles journaled in said bearings and wings extending to one side thereof, bearings formed in said wings, an annular structure mounted in said body, bearings formed in said annular structure, links operatively connecting said annular'structure with the wing extension of each of said cutterholders and journaled in said bearings, a sliding yoke mounted in said body adjacent to said annular structure and cam means operably connecting said annular structure with said yoke.

14. A cutter-head comprising a 7 body formed with bearings, cutter-holders journaled in said bearings, an annular structure mounted in said body and operatively connecting each of said cutter-holders, said annular structure comprising two adjacent rings secured together by means of a block rotatably mounted in one of said rings and projecting into an apertured part of the adjacent rin a transverse screw passing through .sai block and operatively connected therewith and bearing at its ends in said apertured ring, means for turning said screw in its bearings for effecting a relative circumferential adjustment of said rings, and means co-operating with said annular structure for opening and closing the die.

15. A cutter-head comprising a hollow body formed with bearings and a circumferential groove in the face thereof, cutterholders journaled in said bearings, a ring mounted to oscillate in said circumferential groove, means operably connecting said ring with each of said cutter-holders. means mounted in saidbody and connecting said ring through apertures in said face for oscillating said ring, graduations carried on Ill indice carried by said ring.

16. A cutter-head comprisin a body formed with bearings, cutter-ho ders journaled in said bearings, an annular structure mounted in said body and operably connecting each of said cutter-holders, said annular structure bein formed with sockets in its rear face, a siding yoke mounted in said body adjacent to said annular structure formed with bearings, cam carrying trunnions journaled in said bearings adapted to engage the sockets in said annular structure, said cam carrying trunnions formed with circumferential grooves, retaining means carried by said yoke registering with said groove, and means for sliding said yoke.

17. A cutter-head comprising a body formed with recessed bearings, cutter-holders formed with spindles journaled in said bearings, said spindles formed with longitudinal bores providing an annular shoulder adjacent the outer extremity thereof, an internally and externally threaded adjusting screw threaded into an aperture in the inner extremity of said recessed bearing, a retaining screw traversing the bores in said spindles bearinged on said annular shoulder 1 and threaded into said adjusting screw, an

annular structure mounted in said body and operably connecting each of said cutterholders, and a sliding yoke co-operating with said annular structure.

18. A cutter-head comprising a body formed with recessed bearings, cutter-- holders formed with hollow spindles journaled in said bearings, cutter-holder retaining and adjusting means extendin through said hollow s indle and threade -in said body, an annu ar structure mounted in said body and operabl connecting each of said cutter-holders, an a sliding yoke cooperating with said annular structure.

19. A cutter head including in combination, a body having a radially disposed web,

cutter holders pivoted on the body, a ring at one side of said web operatively connecte to said holders, a ring on the other side of said web, means securing said rings for rotative movement together a third ring associated with said body, adjustable means securing the second and third rin s together, means to turn said third ring to close the die, and yielding means acting to open the die.

20. A cutter head including in combination, a bod having a radially dis osed web, cutter holclbrs pivoted on the b0 y, a ring at one side of said web operativel connected to said holders, a ring on the ot or side of said web, means securing said rin for rotative movement together, a thir ring associated with said body, ad'ustable means securing the second and third rings together, means to turn said third ring to atui'e. N. 

